OB MagCalc

Every patient is unique. When using this calculator use your clinical judgement, and monitor labs/clinical parameters frequently.

Select a tool based on your patient's treatment needs:

💉 Bolus Amount
Use during treatment if levels are subtherapeutic.

💧 Infusion Rate
Use to maintain therapeutic levels after a bolus, especially useful in patients with impaired renal function.

⏸️ Hold Time
Use when magnesium levels are above the desired range.

Magnesium Bolus Calculator

When using this calculator monitor frequently.

Enter Serum Magnesium Level:

mg/dL

Estimate BMI:

Suggested Magnesium Bolus:

*This calculation is an approximation and based on assumptions of magnesium kinetics. Monitor levels and adjust as needed.*

Magnesium Infusion Rate Calculator

When using this calculator monitor frequently.

Enter Serum Creatinine:

mg/dL

Estimate Urine Output: Excellent Adequate Decreased None

Renal Function: Stable Deteriorating (generally intrapartum) Improving (postpartum diuresis)

Suggested Infusion Rate (Clearance Rate):

*This calculation is an approximation and based on assumptions of renal function and urine output. Monitor labs and adjust as needed.*

Magnesium Hold Time Calculator

When using this calculator monitor frequently.

Enter Serum Creatinine:

mg/dL

Estimate Urine Output: Excellent Adequate Decreased None

Renal Function: Stable Deteriorating (generally intrapartum) Improving (postpartum diuresis)

Enter Current Magnesium Level:

mg/dL

Enter Desired Magnesium Level:

mg/dL

Suggested Hold Time:

Infusion Rate after Hold (Clearance Rate):

*These calculations are an approximation and based on assumptions of renal function and urine output. Monitor labs and adjust as needed.*